My Rhino hoses came with the silicone grease already applied, inside the bayonet fitting, and the section of the fitting where it "screws" onto the hose itself.
In my opinion, the grease is actually working to enhance the waterproof nature of the connections, rather than provide lubrication or keep anything loose. That's the impression I get from where and how it has been applied by the manuf.
2013 KZ Sportsmen Classic 200, 20 ft TT
2020 RAM 1500, 5.7 4x4, 8 speed